When I need to place a tabular or figure inside a paragraph (usually in exams or class notes) I use {\par\centering <tabular>/<figure>\par} because center environment uses too much vertical space. But I don't like my solution because tabular or figure are too close to previous and following paragraphs. I would like that vertical space between figures and paragraphs was similar to the one between lines. How can I do it?

when i look at the output of your example on my browser screen, the final paragraph isn't justified -- all lines are centered. that shouldn't be. also, there's more space above than below the graphics insertion (black box), where those spaces should be equal. (or perhaps there is something wrong with my browser.)
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barbara beetonMay 2 '13 at 15:00

@barbarabeeton Got it. The centering was a misplaced }. The asymmetric spacing was intentional to demonstrate capability of \addvbuffer. I've edited to correct the first, and highlight the second.
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Steven B. SegletesMay 2 '13 at 15:32